The maker of sriracha is under fire, neighbors saying the factory is giving them burning eyes and headaches. The city is suing the company. And david wright has the story. Reporter: The burning issue in irwindale, california, is the spicy scent wafting out of the hot sauce factory. It produces headaches in many cases. Reporter: The town is now suing huy fong foods to stop production, calling the plant a public nuisance. You can smell it. How you make hot sauce? Hot sauce needs spices. Reporter: The owner and founder, david tran, says he's been making sriracha sauce for 30 years, and never got a complaint from the neighbors until he moved the factory to irwindale. The secret family recipe is hugely popular. 20 million bottles a year. Worth $60 million in annual revenue. Inside the factory -- my eyes are watering. The air is hotter than the spiceiest noodles you ever tasted. And up on the roof, tran points out carbon filters he installed after complaints last year, to make sure the outside air isn't so toxic. Underneath this fan is the spiceiest part of the factory. But there's filters. And you can smell spicy food. But it's not going to make your eyes water. At saigon noodles, one block away, they don't know what the fuss is about. Anything, more sriracha. Reporter: A fiery debate in more ways than one. For "good morning america," david wright, abc news, irwindale, california. I love this next story. I do, too.

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